Yeah, I'm gonna put 4 of these in my lifegain deck so I can cast them for 4 mana each and get a 4/4 angel every time I gain 4 life on a turn. Then I'm gonna go 4-0 at FNM and win 4 packs, and might celebrate by getting a #4 at McDonald's afterwards.

They should have printed an opposite version of this enchantment as well. One that spits out a Demon, when ever some one takes damage (or something) with flavor text that says As angels are drawn to acts of benevolence, demons are drawn to suffering.